'\" t
.\"     Title: trace_irq_handler_entry
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: IRQ
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "TRACE_IRQ_HANDLER_EN" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "IRQ"
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.SH "NAME"
trace_irq_handler_entry \- called immediately before the irq action handler
.SH "SYNOPSIS"
.HP \w'void\ trace_irq_handler_entry('u
.BI "void trace_irq_handler_entry(int\ " "irq" ", struct\ irqaction\ *\ " "action" ");"
.SH "ARGUMENTS"
.PP
\fIirq\fR
.RS 4
irq number
.RE
.PP
\fIaction\fR
.RS 4
pointer to struct irqaction
.RE
.SH "DESCRIPTION"
.PP
The struct irqaction pointed to by
\fIaction\fR
contains various information about the handler, including the device name,
\fIaction\fR\->name, and the device id,
\fIaction\fR\->dev_id\&. When used in conjunction with the irq_handler_exit tracepoint, we can figure out irq handler latencies\&.
.SH "AUTHORS"
.PP
\fBJason Baron\fR <\&jbaron@redhat.com\&>
.RS 4
Author.
.RE
.PP
\fBWilliam Cohen\fR <\&wcohen@redhat.com\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br